We have customers experiencing this problem as well

The attached error occurred on Windows 7 64bit machine running zDesktop 2.0.1 10659. zDesktop seems to run fine for a few days then the jscript error appears and zdesktop services have to be stopped and zdesktop restarted. The problem is chronic.

Users running same zDesktop version on WinXP and on OS X 10.6 experience these errors as well.